Coated paper



H. H. MAHLER COATED PAPER April 10, 1956 FIG. E1

Filed Dec. 1, 1955 INVENTOR. HARRY H MAHLER BY ez United States Patent2,741,564 COATED PAPER Harry H. Mahler, Newton Center, Mass. ApplicationDecember 1, 1953, Serial No. 395,475

3 Claims. (Cl. 117-37) The present invention relates to a tape or sheetof thin flexible material on which is deposited a light amorphousmicrocrystalline wax in a very thin coating for the purpose of using itto adhere small paper pieces, such as stamps or other emblems or thelike.

The present invention is more particularly concerned with the mountingof postage stamps for stamp collectors on cards to provide a securemounting, but yet the postage stamp may be readily removed when desired.

The means according to the present invention permits the transmission ofcollectors stamps through the mail from place to place with theassurance that the stamps will always be securely kept in goodcondition.

Up to the present time, cards of this type were usually prepared with anapplication of rubber cement and the stamps were attached to them.Rubber cement is not only uneconomical since it is expensive, but alsothe stamps adhere strongly and cannot be readily peeled olf andtherefore are often damaged when they are removed from the paper card.

In accordance with the present invention, the paper or other type ofstrip material is coated on both sides with a thin coating of a specialtype of microcrystalline wax, which is known in the trade as Flexo-Wax Cor Flexo- Wax C Light, which is described in my copending applicationSerial No. 233,156, filed June 23, 1951. Flexo- Wax C is a specificproduct having properties clearly defined in several technicaldictionaries. This product is defined in Concise Chemical and TechnicalDictionary edited by H. Bennett and published by Chemical Publish-' ingCompany. On page 405, Flexo-Wax C is defined as Long chain hydro-carbon;organic amorphous wax;

specific gravity 0.82 melting point 63-8 in water; soluhle in hottoluene; used for engravings, coatings, polishes, etc. I have describedthe type of wax which I use on small plastic plates. I have discovered,however that this wax may also be applied to sheet material and to rollsor strips for accomplishing substantially the same purpose, but theapplication is somewhat different.

In the present invention, the wax is applied to a tape or strip in sucha manner that when it dries the surface is crystallized somewhat likeice crystallizations on a glass surface. These crystals maye be formedin a general pattern of lines depending upon how the wax is applied tothe sheet or to the paper and as such these lines of crystals will formthe equivalent of embossing or raised lines of wax surface on the paperor on the thin cards or sheets to which they are applied.

The paper or tape is preferably coated on both sides so that the stripor paper or little pieces of it may be mounted on a card to which thestamps or other similar elements may be secured. The remarkable featureabout this type of mounting is that while the stamps are secured firmlythey may be readily peeled off without any difiiculty and withoutdestroying any portion of the stamp or taking olf any of the papersurface on the stamp side.

The method of making the tape or strip of paper and the method ofapplying the wax to it will be described more fully in the specificationas set forth below when taken in connection with the drawingsillustrating an embodiment of the invention, in which: v

Figure 1 shows a section through the device by means of which the waxmay be applied.

Figure 2 is a plan view of a section coated with the material, and,

Figure 3 is a card showing stamps mounted by the use of the presentinvention.

In the figures, 1 indicates a container which is provided with a pick-uproll 2 and a second roll 3, the two surfaces of which lightly touch oneanother along a contact surface 4.

The roll 2 is immersed in the wax which is of the type described in myprevious application of which the best of a strip of paper known exampleis Flexo-Wax C or Flexo-Wax C Light. This is a well known type ofamorphous crystalline hydro-carbon wax which is very uniform inconsistency and which has a melting point in the neighborhood of F.Flexo-Wax C is retained in a melted condition just below the normalmelting point of the wax and the roll 2 is of such a type that itssurface will easily pick up the wax coating by means of which the waxwill be coated or carried on the engaging or touching roll 3. The roll 3has in contact with it the paper strip 5 which is moved over the roll bywinding motor 6 at one end which carries a spindle 7 on which the tapemay be wound.

A pair of clamps 8, 8' may be applied at either side of the roll 3 tokeep the paper 5 in contact with the roll, 3. The distance between thecontact 9 at the roll 3 and the clamp 8 is such that the Wax willsubstantially dry by the time the coated roll is wound on the spindle 7or comes beneath the clamp 8. This however is not abso lutely essentialsince the Flexo-Wax C will quickly crystallize and form lines ofprojecting crystalline wax from the surface of the paper very quicklyafter the wax has been deposited. This is readily shown by thestriations 10, 10, in Figure 2, which shows one face of the wax surface.By these means the surface is coated with embossed lines of themicrocrystalline Flexo-Wax C, in such a manner that a postage stamp orany similar item will readily stick to its surface. The sheet of paperis preferably coated at both sides so that it may be put as a base on acard to which the stamps may be adhered. This is shown in Figure 3 where11 is a paper card and 12 indicates a strip of paper to which theFlew-Wax C has been applied on both sides as described above, and 13indicates a postage stamp or other similar article which is adhered tothe surface of the strip 12.

The striations in the Flexo-Wax C will depend somewhat upon how heavy acoating is applied to the sheet. In general however they may be made tobe spaced apart to & with the striations of crystallization runningoutwards at angles on either side of the general line in the directionto which the striations extend.

There would be no difiiculty in rolling the strips as an ordinary tapewould be rolled in a tape roll since when once the crystallization hastaken place on the sheet and the sheet is fairly cool, the successivelayers of tape will not stick together, so that the tape may be usedconveniently in rolls or strips or in any other form.

Where stamps and other similar items are to be mounted on a. card orcard-board, then the card-board itself may be mounted in the same mannerthat one side of the tape is coated for the same purpose. The stamps maythen be applied to one side of the card in the same manner as they areapplied to the tape.

Having now described my invention, 1 claim:

1. A flat paper tape coated on both surfaces with an amorphousmicro-crystalline hydro-carbon wax which completely coats the tape andhas crystallized lines of wax surface running in the general directionparallel to the lengthwise direction of the tape.

References Cited in the file of this patent 9 UNITED STATES PATENTS2,337,377 Dreyfus Dec. 21, 1943 2,339,446 Ziegler Jan. 18, 19442,373,634 Wagner Apr. 11, 1945 10

1. A FLAT PAPER TAPE COATED ON BOTH SURFACES WITH AN AMORPHOUSMICRO-CRYSTALLINE HYDRO-CARBON WAX WHICH COMPLETELY COATS THE TAPE ANDHAS CRYSTALLIZED LINES OF WAX EXTENDING IN STRIATIONS OVER THE COATEDSURFACE FORMING EMBOSSING ON THE WAX SURFACES ON BOTH FACES OF THE TAPE